bone_data {JOPS}

Spinal bone relative mineral density

Description

Relative spinal bone mineral density measurements on 261 North American adolescents. Each value is the difference in spnbmd taken on two consecutive visits, divided by the average. The age is the average age over the two visits.

Usage

data(bone_data)

Format

A dataframe with four columns:

idnum

ID of the child

age

age

gender

male or female

spnbmd

Relative Spinal bone mineral density.

Source

https://web.stanford.edu/~hastie/ElemStatLearn/datasets/bone.data

References

Bachrach, L.K., Hastie, T., Wang, M.-C., Narasimhan, B., Marcus, R. (1999). Bone Mineral Acquisition in Healthy Asian, Hispanic, Black and Caucasian Youth. A Longitudinal Study. J Clin Endocrinol Metab 84, 4702-12.

Eilers, P.H.C. and Marx, B.D. (2021). Practical Smoothing, The Joys of P-splines. Cambridge University Press.